Add Travis CI support

To improve the code quality of binder, this commit adds support for continuous
integration by using Travis CI (https://travis-ci.org/).
This will ensure that every commit and every pull request will trigger test
runs of the tests included in binder, helping to avoid code with broken tests.

.travis.yml

@@ -0,0 +1,11 @@
+language: python
+python:
+  - "2.7"
+env:
+  - DJANGO="Django>=1.6,<1.7"
+  - DJANGO="Django>=1.7,<1.8"
+install:
+  - pip install -q $DJANGO
+  - pip install -r requirements.txt
+script:
+  - python manage.py test

README.markdown

@@ -1,5 +1,7 @@
 # Binder #
 
+[![Build Status](https://travis-ci.org/jforman/binder.svg?branch=master)](https://travis-ci.org/jforman/binder)
+
 A Django web application for viewing and editing BIND DNS zone records.
 
 Binder supports adding and deleting DNS records (and eventually editing in place). TSIG-authenticated transfers and updates are supported.